Can anyone who has looked into this in detail tell me whether there is significant material available from this source that relates to the Luftwaffe during the 1940 period? My impression over the years is that ULTRA wasn't a particularly well-developed or useful intelligence source during that period. Can someone who has looked into this in detail give me their opinion about this?

Thanx,

Hi Larry, certainly the presentation of the material wasn't as well developed as it later became and I think it would take more work from a researcher to get something from it. I'm attaching my entire collection (really!) of 1940 Ultra messages to illustrate the point (from file HW5/4).